This question is about waves.

1. (a)(i)The diagram shows water waves. [Figure 6] On Figure 6, label one wavelength.[1]
2. (a)(ii)A student measures the wavelength of the waves as 2.4 cm. The frequency of the waves is 3.5 Hz. Calculate the speed of the waves.[2]
3. (a)(iii)State what is meant by the frequency of a wave.[1]
4. (b)Sound waves can be reflected. Describe how sound waves can be used to measure the depth of the sea.[3]
5. (c)A student observes a rainbow. Explain how a rainbow is formed.[3]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.